Chemistry Letters, Vol.34, No.9, 1214-1215, 2005
Methods for preparing standard nitrate radical (NO3) gas to calibrate the LIF-based instrument for measurements in the atmosphere
Preparation of standard NO3 gas is explored at the level of ppbv for atmospheric measurements utilizing an LIF instrument. The sequence of thermal decomposition of N2O5 and gas phase titration of NO3 by adding NO is useful. To reduce NO2 contamination in N2O5, N2O5 trapping after mixing NOx and O-3 was adopted. As a convenient method in the field studies, dynamic mixing NOx and O-3 was explored.